In Class Midterm Review

Question 1

When NCCs migrate into the mesenchyme, what do they go through?

Answer 1

The EMT

Question 2

What are NCCs called after they go through the EMT?

Answer 2

Ectomesencyme

Question 3

Ectomesencyme, which is derived from NCCs, make up parts of what?

Answer 3

The cranium

Question 4

What embryological tissue makes up the teeth?

Answer 4

Mesoderm and ectoderm

Question 5

In the bell stage of tooth development, what is underneath the forming tooth?

Answer 5

The pulp and dentin

Question 6

The Bell stage forms what through reciprocal induction?

Answer 6

Cementum and dentin

Question 7

What type of bone is the clavicle made from?

Answer 7

Intramembranous bone

Question 8

From the neck up, what kind of bone is there?

Answer 8

Intramembranou bone

Question 9

From the neck down what kind of bone is there?

Answer 9

Endochondral bone

Question 10

What is the tympanic membrane made of?

Answer 10

Pouches and grooves

Question 11

What does Meckel’s cartilage give rise to?

Answer 11

Incus and Malleus

Question 12

Does the mandible grow directly from Meckel’s cartilage?

Answer 12

No

Question 13

Where do odontoblasts come from?

Answer 13

They derive from ectomesencymal cells

Question 14

Between the inner and outer enamel epithelium, the space is hydrophillic so water is pulled in and the cells look like “stars”. What is this called?

Answer 14

Stellate reticulum

Question 15

Stuff “underneath the cap”

Answer 15

Dental papilla

Question 16

When osteoblasts become trapped in matrix, what do they develop into?

Answer 16

Osteocytes

Question 17

What forms osteoclasts?

Answer 17

The fusion of many cells derived from circulating monocytes in the blood

Question 18

Where do osteoblasts come from?

Answer 18

They come from the differentiation of osteogenic cells

Question 19

What is the specific growth center of the bone?

Answer 19

Physis

Question 20

T/F: The joint grows at a different rate from the shaft

Answer 20

True

Question 21

For long bones, what is the primary center of ossification?

Answer 21

Diaphysis

Question 22

For long bones, what is the secondary center of ossification?

Answer 22

Epiphysis

Question 23

What is enamel derived from?

Answer 23

Ectoderm

Question 24

What forms the maxilla and mandible, which is also a layer over the ectomesenchyme?

Answer 24

Dental lamina

Question 25

What’s the name of mineral in bone, dentin and cementum?

Answer 25

Hydroxyapatite

Question 26

What tissue of the tooth is technically “dead”?

Answer 26

Enamel (no vascularization)

Question 27

Amelogenesis is the formation of ameloblasts from what tissue?

Answer 27

Inner enamel epithelium

Question 28

What’s the name of the second arch?

Answer 28

Reichert’s cartilage